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We can never expect ____ bluer sky unles...

We can never expect ____ bluer sky unless we create _____less polluted world.

A. a; a        B. a; the         C. the; a      D. the; the

 

A 【解析】考查冠词辨析。你永远别指望一个更加蓝的天空除非我们创造一个更少污染的世界。两个均为泛指。
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